ABB GSB 245, Technical Manual

12

TR A N S FOR M E R BUS H I NG S T Y PE G S B 

T EC H N I C A L  G U I D E

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Connection details

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06 Outer terminal.

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07 Outer shield - GSB 420 and 550.

∅

152.5

D2

125

The outer terminal needs to be specified in each case. The 
outer terminal is then used together with a draw rod, an 
inner terminal, or a fixed bottom contact.

Outer terminal

The outer terminal consists of a cylindrical stud. The 
mounting arrangements are the same for all GSB bushings, 
regardless of size, current rating and internal connection 
system. All GSB terminal studs will thus fit any GSB bushing.

The terminal stud assembly consists of a stud, a tightening 
ring, a gasket, bolts and washers. The electrical contact 
function and the sealing function are completely separated. 
The stud is first fastened to the bushing top with 6 bolts, 
M10, which provide the proper electrical contact. The 
contact surface is located inside the gasket and is thus well 
protected from corrosion. Finally, the tightening ring with 
the gasket is pressed against the stud by means of 6 
additional bolts, M8.

The outer terminal is available in a number of standard 
configurations. Other configurations can be supplied on 
request.

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Table 5. Outer terminal. Max. torque on outer terminal 200 Nm.

Cat. No.

Material

Plating

Stud diameter, D2 (mm)

1ZSC999001-AAA

Aluminium

-

30

1ZSC999001-AAB

Aluminium

-

60

1ZSC999001-AAC

Copper

-

30

1ZSC999001-AAD

Copper

-

40

Separate terminal plate with bolts

The separate terminal plate is available for stud with ø30 
mm, and used for connecting the bushing to the line 
conductor.

Outer shield

This shield is standard for GSB 420 (Cat. No. 2748 682-DN) 
and 550 (Cat. No. 2748 682-DY). GSB 245 and 362 fulfil all 
requirements of the IEC and IEEE tests without outer shield. 
However, if extra shielding of the connected power lines is 
required, outer shield (Cat. No. 2748 682-DN) can be 
supplied on request also for these.